Saltshack

Saltshack Educational natural science e-commerce specialising in materials science, mineralogy and geology.
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Proudly evidence-based and actively opposed to metaphysical marketing. Subscribe to gain access to the private subscriber page or visit our shop in MK 🧪 We Are a Family-Run Geology Company

Specialising in natural science education and high-quality geological goods, we offer an extensive selection of crystals, minerals, fossils, salt lamps, and jewellery sourced from around the globe. We meticulou

sly manage dozens of supply chains to ensure competitive prices and take pride in sourcing even the rarest specimens. From pop-up shops and concession stands to online galleries and social media platforms, we’re passionate about making geology accessible and exciting for everyone. Explore our educational materials—including videos, reels, audiobooks, and essays—covering science, mineralogy, geology, and other captivating topics. Visit us in Stony Stratford or shop online through our Facebook and Instagram Stories!

08/06/2026

Daily Quiz 🎯

Answer: B) Corundum

Corundum is the hardest mineral on this list, with a hardness of 9 on the Mohs Hardness Scale.

For comparison:

Talc = 1 (the softest mineral on the scale)

Gypsum = 2

Feldspar = 6

Prase Quartz = 7 (same hardness as quartz)

Topaz = 8

Corundum = 9

Only diamond ranks higher at 10, making corundum the second-hardest naturally occurring mineral.

Corundum is the mineral species that includes the gemstones ruby and sapphire. Its exceptional hardness is why it is also used in abrasives such as sandpaper and grinding wheels.

Correct answer: B) Corundum ✅

Fun fact: The jump between hardness values on the Mohs scale isn't equal. Corundum (9) is significantly harder than topaz (8), and diamond (10) is vastly harder than corundum. It's more like climbing a cliff than stepping up a staircase.

Teach me something about Amethyst 🧠Credit: Albert Russ 📷
08/06/2026

Teach me something about Amethyst 🧠

Credit: Albert Russ 📷

08/06/2026

Nuclear Winter Hypothesis ☢️

Most people imagine nuclear war ending in a flash.

The science suggests the story may not end there.

For decades, researchers have studied the possibility of a "nuclear winter" — a period of global cooling caused not by the explosions themselves, but by vast quantities of soot from urban firestorms rising high into the atmosphere and blocking sunlight.

How much cooling would occur?

How long could it last?

How resilient would modern agriculture and global food systems be?

Some aspects are strongly supported by climate modelling. Others remain uncertain. The exact scale depends on factors that scientists are still working to understand.

In this episode of the Disaster Series, we explore the evidence, the uncertainties, and the sobering science behind one of the most consequential theoretical disasters ever proposed.

No politics.

No sensationalism.

Just the science.

08/06/2026

Groundwater Expained 📚🌊

Most people think freshwater lives in rivers.

Or lakes.

Or reservoirs.

But the vast majority of Earth's liquid freshwater is hidden underground.

Moving silently through cracks, pores, sediments, and rock beneath our feet.

Invisible.

Out of sight.

Easy to forget.

Groundwater feeds rivers during droughts, supplies drinking water to billions of people, supports agriculture, shapes landscapes, and helps create caves.

Yet most of us never see it.

In this episode we explore the hidden world beneath the surface, from porosity and aquifers to fossil groundwater that may have been underground for tens of thousands of years.

Because the landscape we see is only part of the story.

Beneath every forest, every farm, every city, and every mountain lies another world entirely.

A vast hidden network of moving water quietly shaping our planet from below.

"Professional" translates as "Behave how we want you to behave, and not like who you are" 😉
07/06/2026

"Professional" translates as "Behave how we want you to behave, and not like who you are" 😉

07/06/2026

U.V Minerals 🎵 - Lyrics by Luke J Timberlake ✏️

I am actually a little late writing this update. In reality, I am five months and eight days sober... and I think the re...
07/06/2026

I am actually a little late writing this update. In reality, I am five months and eight days sober... and I think the reason I am late writing it is because I have reached the point in my yearly sobriety where I no longer check the app that tracks it obsessively. I can chalk this up to changing content creation habits, where I spend less time with my head buried in my phone, or I can chalk it up to the fact that not drinking has become so firmly baked into my day-to-day life that it never even crosses my mind.

If it's your first time reading one of these updates, I give up drinking for an extended period of time and isolate my casual drinking to the latter months of the year. It's something I have done for years simply because, by the time I am 40 (18 months from now), I want to give up completely. Acclimatising to that goal in the build-up to it will feel much easier than imposing a date-based prohibition on myself.

I write these because I am acutely aware that public accountability makes it easier to stay on course, and because keeping this kind of diary helps contextualise the benefits of sobriety for those who are either considering giving up, or for those who drink so casually that they simply don't notice the ways in which it impacts their lives. For example, someone who drinks only once every couple of weeks can still experience noticeable increases in stress levels, reduced quality of sleep, and a general lethargy that comes on so slowly that people easily confuse it with a feature of who they are, rather than an external influence acting upon their physiology.

I am, in every respect, a workaholic. I am self-aware enough to admit that. But until quite recently, the workload I was setting myself was genuinely making me miserable. To the point, in fact, that I was approaching both mental and physical burnout.

Perhaps you're new to this page and don't realise that my modus operandi used to be posting every hour of every day. Something that required me to live inside my phone. Whilst I had convinced myself, and told others, that I could do that in perpetuity... everyone who warned me was absolutely correct.

Today, my sense of calm and control is clearly reflected in this page. As opposed to making hundreds of videos a month out of some bizarre and self-inflicted sense of duty, I now post two videos a day in a coherent, documentary-style, long-form format. Subjects are organised into playlists. That organisation and control are very much an extension of sobriety. I am self-aware enough to acknowledge that.

Today, I get more time with my family. I have controlled and sensible routines for content creation, and I have fallen in love with my hobby again after that bizarre sense of duty had genuinely caused me to hate it.

What's amazing is that this level of organisation allows me to spread content across five separate platforms with the same methodical care. Which means we are growing everywhere as a result of order and attention to detail, rather than growing disproportionately on whichever platform happens to own my focus.

I feel that, in many ways, I have got my life back. A life that was suffocating under the weight of its own sense of duty. It means I now spend three hours a day creating content instead of four days a week—which, I kid you not, was my old system.

There are few physiological benefits to report that haven't already appeared in previous blogs, because most of the physical benefits occur within the first four months. The fifth month, however, has largely been about emotional wellbeing and control. I now exist outside of my phone and am able to focus on tangible projects and public speaking opportunities that would otherwise have been sidelined because I knew there would always be content waiting to be created.

By Luke J. Timberlake ✏️

What would you prefer 🤔 - I am currently reading a book called 'Rare Earth Element Frontiers' because I was planning on ...
07/06/2026

What would you prefer 🤔 - I am currently reading a book called 'Rare Earth Element Frontiers' because I was planning on making a long form video explaining Rare Earth Elements.

Now, there are a few ways I can do this. I can make one very long video which will likely take days to make, given i'd need a solid 30 minutes to do it justice. Or, I can turn it into a series, which is where I feel I can do it more justice.

There are 17 Rare Earth Elements, and I think one episode, irrespective of how long I make it will be summary out of necessity.

Whereas, if I make a series, I can flesh out each REE individually in a specific video to lend context that people can draw upon whenever they need to refresh their memory, and then expand that into things like geopolitics, refining, uses etc, as that series broadens.

But I thought I would put this to a public vote given I am always fishing around for a new project, and I am already doing tbe preliminary research. All I need to k ow is whether I do one documentary style video, or a series of ten minute episodes to legitimately do the subject justice.

Please let me know

Luke J Timberlake ✏️

06/06/2026

La Palma Tsunami Hypothesis 🌊

Could a volcanic island in the Atlantic really generate a tsunami capable of crossing an entire ocean?

For years, headlines warned that a future collapse on La Palma could unleash a "mega-tsunami" toward Europe, Africa and even North America. The story spread across documentaries, newspapers and the internet, becoming one of the most famous geological disaster scenarios ever proposed.

But how much of it is actually supported by evidence?

In this episode, we explore the geology of the Canary Islands, the giant ancient landslides hidden beneath the Atlantic, the origins of the mega-tsunami hypothesis, and what modern research says about the real risks.

As is often the case in science, the answer is more complicated than either the alarmists or the sceptics would have you believe.

🌋 Ancient volcanic collapses are real.
🌊 Tsunamis generated by landslides are real.
🤔 The scale of a future event remains uncertain.

The goal isn't to scare people.

It's to understand what the evidence actually says.

06/06/2026

Earth's Magnetic Field 🧲🌎

Most of us never think about Earth's magnetic field.

You can't see it.

You can't touch it.

You don't wake up in the morning wondering whether the planet's molten iron core is still generating a magnetosphere.

And yet your entire civilisation exists beneath its protection.

Deep beneath your feet, thousands of kilometres below the crust, an ocean of liquid iron is constantly moving. Those motions generate a magnetic field that stretches far into space, helping shield Earth from the solar wind and shaping phenomena as beautiful as the aurora.

It also leaves its fingerprints in volcanic rocks, records its own reversals through geological time, and provides one of the clearest reminders that Earth is not a cold, dead sphere drifting through space.

The planet is still active.

Still dynamic.

Still generating the invisible shield that protects life above.

In this episode we explore the science behind Earth's magnetic field, the geodynamo, magnetic pole reversals, auroras, and why our planet may be far more alive than it appears.

Because sometimes the most important geological processes are the ones we never see.

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Milton Keynes
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